1. The earliest known use of the term "X" in sports was in 1992 when Michael Jordan's wife started X Inc. to commercialize his brand. Now "X" is commonly used as an acronym for the best athlete in a sport, which likely traces back to Jordan.
2. A famous sports incident can be modeled by a basic parabolic equation involving a height of 1.038m reached with an initial velocity of 4.51m/s over a distance of 4.57m in 0.98s.
3. Rafe Bartholomew named his book on the Philippine's obsession with basketball "Kingdom of X" after covering the country's professional basketball league.